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The following is an archive of the [[Strength of Materials]] website created by Drake Damerau
The following is an archive of the [[Strength of Materials]] website created by Drake Damerau
----
----
John's Fin/Glue Tensile Samples (detailed construction and results notes*)
{| class="wikitable" style="margin:auto"
|-
!Test !! Material !! Glue Used !! Notes !! Peak Load (lbs)
|-
| 1-1A || G-10 || Bob Smith || Picture After Test || 503.131
|-
| 1-1B || G-10 || Bob Smith || Close Up Pic || 441.942
|-
| 1-1C || G-10 || Bob Smith || || 508.475
|-
| 1-2-A || G-10 || West Systems || Close Up Pic || 2379.331
|-
| 1-2-B || G-10 || West Systems || || 2337.961
|-
| 1-2-C || G-10 || West Systems || || 2322.104
|-
| 1-3-A || G-10 || Aeropoxy PR2032 || || 1937.386
|-
| 1-3-B || G-10 || Aeropoxy PR2032 || || 2037.357
|-
| 1-3-C || G-10 || Aeropoxy PR2032 || || 1662.633
|-
| 1-4-A || G-10 || Aeropoxy EX6209 || || 2574.789
|-
| 1-4-B || G-10 || Aeropoxy EX6209 || || 2383.984
|-
| 1-4-C || G-10 || Aeropoxy EX6209 || || 2239.198
|-
| 1-1-D || 5 ply || Bob Smith || Picture After Test || 1016.953
|-
| 1-1-E || 5 Ply || Bob Smith || || 1337.724
|-
| 1-1-F || 5 Ply || Bob Smith || || 950.419
|-
| 1-2-D || 5 Ply || West Systems || || 986.271
|-
| 1-2-E || 5 Ply || West Systems || || 1034.878
|-
| 1-2-F || 5 Ply || West Systems || || 1171.047
|-
| 1-3-D || 5 Ply || Aeropoxy PR2032 || || 1263.091
|-
| 1-3-E || 5 Ply || Aeropoxy PR2032 || || 977.309
|-
| 1-3-F || 5 Ply || Aeropoxy PR2032 || || 825.455
|-
| 1-4-D || 5 Ply || Aeropoxy EX6209 || || 2047.869
|-
| 1-4-E || 5 Ply || Aeropoxy EX6209 || || 1829.139
|-
| 1-4-F || 5 Ply || Aeropoxy EX6209 || || 2337.961
|-
| 1-10-A || Glassed 5 Ply || West Sys 105/206 || || 1909.807
|-
| 1-10-B || Glassed 5 Ply || West Sys 105/206 || Typical Break || 1800.010
|-
| 1-10-C || Glassed 5 Ply || West Sys 105/206 || || 1749.851
|-
| 1-11-A || Glassed 5 Ply || Aeropoxy EX6209/PR2032 || || 1933.147
|-
| 1-11-B || Glassed 5 Ply || Aeropoxy EX6209/PR2032 || || 2300.385
|-
| 1-11-C || Glassed 5 Ply || Aeropoxy EX6209/PR2032 || || 1900.843
|}
*Click on the link under material. There, you will see a picture of the test specimen. The two pieces are glued together at the overlap. The glued area is 1.0" x 1.5". The sample here is pulled apart. This tests the shear strength of the glue joint.
John's Fin/Glue Tensile Samples Recycled
I took several of John's samples and re-glued them on the opposite side. The samples were flipped over lightly sanded and glued. The specimens have the same amount of area glued but were done a little differently. John glued whole sheets then cut them where I glued the already cut pieces. The different construction methods explain the wider sample to sample variation seen in the recycled samples over John's samples. The CY was applied to both pieces before assembly. The CY actually delaminated the fiberglass when broke. (photos)
{|
|-
! Test !! Material !! Glue Used !! Notes !! Peak Load (lbs)
|-
| R1 || G-10 || Super Jet - Cyanoacrylate || || 2715.958
|-
| R2 || G-10 || Super Jet - Cyanoacrylate || Delamination! || 3346.816
|-
| R3 || G-10 || Super Jet - Cyanoacrylate  || || 2685.450
|-
| R4 || G-10 || Dexter Hysol Epoxy-Patch || Thick, good on fillets || 2401.207
|-
| R5 || G-10 || Dexter Hysol Epoxy-Patch || Thick, good on fillets || 2119.919
|-
| R6 || G-10 || Dexter Hysol Epoxy-Patch || Thick, good on fillets || 2366.401
|-
| R7 || G-10 || West Systems || 2 Years Old || 2303.156
|-
| R8 || G-10 || West Systems || 2 Years Old || 2291.224
|-
| R9 || G-10 || West Systems || 2 Years Old || 2288.344
|-
| R10 || 5 Ply || Super Jet - Cyanoacrylate || || 724.449
|-
| R11 || 5 Ply || Super Jet - Cyanoacrylate || || 1011.781
|-
| R12 || 5 Ply || Super Jet - Cyanoacrylate || || 904.399
|-
| R13 || 5 Ply || Dexter Hysol Epoxy-Patch || Thick, good on fillets || 1093.483
|-
| R14 || 5 Ply || Dexter Hysol Epoxy-Patch || Thick, good on fillets || 1160.705
|-
| R15 || 5 Ply || Dexter Hysol Epoxy-Patch || Thick, good on fillets || 1024.537

Revision as of 20:30, 27 December 2025

The following is an archive of the Strength of Materials website created by Drake Damerau

John's Fin/Glue Tensile Samples (detailed construction and results notes*)

Test Material Glue Used Notes Peak Load (lbs)
1-1A G-10 Bob Smith Picture After Test 503.131
1-1B G-10 Bob Smith Close Up Pic 441.942
1-1C G-10 Bob Smith 508.475
1-2-A G-10 West Systems Close Up Pic 2379.331
1-2-B G-10 West Systems 2337.961
1-2-C G-10 West Systems 2322.104
1-3-A G-10 Aeropoxy PR2032 1937.386
1-3-B G-10 Aeropoxy PR2032 2037.357
1-3-C G-10 Aeropoxy PR2032 1662.633
1-4-A G-10 Aeropoxy EX6209 2574.789
1-4-B G-10 Aeropoxy EX6209 2383.984
1-4-C G-10 Aeropoxy EX6209 2239.198
1-1-D 5 ply Bob Smith Picture After Test 1016.953
1-1-E 5 Ply Bob Smith 1337.724
1-1-F 5 Ply Bob Smith 950.419
1-2-D 5 Ply West Systems 986.271
1-2-E 5 Ply West Systems 1034.878
1-2-F 5 Ply West Systems 1171.047
1-3-D 5 Ply Aeropoxy PR2032 1263.091
1-3-E 5 Ply Aeropoxy PR2032 977.309
1-3-F 5 Ply Aeropoxy PR2032 825.455
1-4-D 5 Ply Aeropoxy EX6209 2047.869
1-4-E 5 Ply Aeropoxy EX6209 1829.139
1-4-F 5 Ply Aeropoxy EX6209 2337.961
1-10-A Glassed 5 Ply West Sys 105/206 1909.807
1-10-B Glassed 5 Ply West Sys 105/206 Typical Break 1800.010
1-10-C Glassed 5 Ply West Sys 105/206 1749.851
1-11-A Glassed 5 Ply Aeropoxy EX6209/PR2032 1933.147
1-11-B Glassed 5 Ply Aeropoxy EX6209/PR2032 2300.385
1-11-C Glassed 5 Ply Aeropoxy EX6209/PR2032 1900.843
  • Click on the link under material. There, you will see a picture of the test specimen. The two pieces are glued together at the overlap. The glued area is 1.0" x 1.5". The sample here is pulled apart. This tests the shear strength of the glue joint.


John's Fin/Glue Tensile Samples Recycled

I took several of John's samples and re-glued them on the opposite side. The samples were flipped over lightly sanded and glued. The specimens have the same amount of area glued but were done a little differently. John glued whole sheets then cut them where I glued the already cut pieces. The different construction methods explain the wider sample to sample variation seen in the recycled samples over John's samples. The CY was applied to both pieces before assembly. The CY actually delaminated the fiberglass when broke. (photos)

Test Material Glue Used Notes Peak Load (lbs)
R1 G-10 Super Jet - Cyanoacrylate 2715.958
R2 G-10 Super Jet - Cyanoacrylate Delamination! 3346.816
R3 G-10 Super Jet - Cyanoacrylate 2685.450
R4 G-10 Dexter Hysol Epoxy-Patch Thick, good on fillets 2401.207
R5 G-10 Dexter Hysol Epoxy-Patch Thick, good on fillets 2119.919
R6 G-10 Dexter Hysol Epoxy-Patch Thick, good on fillets 2366.401
R7 G-10 West Systems 2 Years Old 2303.156
R8 G-10 West Systems 2 Years Old 2291.224
R9 G-10 West Systems 2 Years Old 2288.344
R10 5 Ply Super Jet - Cyanoacrylate 724.449
R11 5 Ply Super Jet - Cyanoacrylate 1011.781
R12 5 Ply Super Jet - Cyanoacrylate 904.399
R13 5 Ply Dexter Hysol Epoxy-Patch Thick, good on fillets 1093.483
R14 5 Ply Dexter Hysol Epoxy-Patch Thick, good on fillets 1160.705
R15 5 Ply Dexter Hysol Epoxy-Patch Thick, good on fillets 1024.537
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